Hitzu co. sold a copier costing $3,500 with a two-year parts warranty to a customer on august 16, 2018, for $7,000 cash. hitzu uses the perpetual inventory system. on november 22, 2019, the copier requires on-site repairs that are completed the same day. the repairs cost $106 for materials taken from the repair parts inventory. these are the only repairs required in 2019 for this copier. based on experience, hitzu expects to incur warranty costs equal to 4% of dollar sales. it records warranty expense with an adjusting entry at the end of each year.